CN101964608A - Photovoltaic power generation distribution type maximum power output system - Google Patents
Photovoltaic power generation distribution type maximum power output system Download PDFInfo
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- CN101964608A CN101964608A CN2010102810132A CN201010281013A CN101964608A CN 101964608 A CN101964608 A CN 101964608A CN 2010102810132 A CN2010102810132 A CN 2010102810132A CN 201010281013 A CN201010281013 A CN 201010281013A CN 101964608 A CN101964608 A CN 101964608A
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention provides a photovoltaic power generation distribution type maximum power output system, which comprises a solar energy collection device, a forestage control module series set, a backstage control module set and an inverse conversion module, wherein the solar energy collection device comprises more than two groups of photovoltaic modules which collect solar energy, convert the solar energy into direct current power and send the direct current power to forestage control modules; the forestage control module series set comprises more than two groups of forestage control modules which correspond to the photovoltaic modules one by one and are connected in series, and the forestage control modules convert a voltage and then output an electric current to backstage control modules; the backstage control module set comprises more than two backstage control modules which are connected in parallel, and the backstage control modules perform direct current voltage conversion and send the conversion result to the inverse conversion module; and the inverse conversion module outputs the electric current. In the invention, a current and voltage two-stage control mode is adopted, the control structure eliminates influences on adjacent modules, the photovoltaic modules in the same group have no influences on one another and are not required to acquire the information of the adjacent modules, so that the output control of the module is simplified, the control over the power output and the stability and reliability of the power generation system are improved.
Description
Technical field
The present invention relates to the distributed maximum power output system of a kind of photovoltaic generation.
Background technology
The elementary cell of photovoltaic generating system is a photovoltaic module.The photoelectric characteristic of photovoltaic module shows as non-linear, and its power curve exists peak value, and therefore, people have proposed a large amount of MPPT maximum power point tracking (MPPT) method, guarantees that the power output of photovoltaic module reaches maximum.Photovoltaic system is made up of the polylith photovoltaic module, and these photovoltaic modules are connected with parallel way by series connection, forms photovoltaic array.Under even illumination condition, the power curve unanimity of each photovoltaic module, there is unique peak value in the power curve of photovoltaic array.Under part shade condition, the power curve difference of each photovoltaic module, the multimodal phenomenon appears in the power curve of photovoltaic array.At this time, photovoltaic generating system may not have Maximum Power Output.
In various MPPT technical schemes, can be divided into centralized MPPT and distributed MPPT.The practice of centralized MPPT scheme is, compensates according to the comprehensive function of overall optical electroplax array.And the practice of distributed MPPT scheme is, carries out independent compensation according to the independent output of every photovoltaic module.At this time, the power output of every solar panel all reaches maximization, and therefore distributed MPPT improves the most promising technology of solar power system production of energy rate.Present power output control structure is connected in parallel behind each photovoltaic module series direct current voltage transformation module as shown in Figure 1, photovoltaic module that is connected in parallel and the direct voltage modular converter combined-voltage modular converter that is connected in series.Current value, magnitude of voltage all change in voltage transformation power output process in this structure, cause interior on the same group photovoltaic module to influence each other, need to obtain the information of adjacent block, can influence each other between the adjacent block.Want each modular power output of balance, need very complicated output control, the complexity of output control has not only promoted controls cost, and has a strong impact on the reliability and stability of control, thereby influences the stability and the reliability of electricity generation system.
Summary of the invention
The technical problem to be solved in the present invention provides the distributed maximum power output system of photovoltaic generation that a kind of power output control is simple, reliable and stability is high.
In order to address the above problem, the invention provides the distributed maximum power output system of a kind of photovoltaic generation, comprising:
Solar collecting device, described solar collecting device comprises 2 groups of above photovoltaic module groups, each photovoltaic module all is connected with the prime control module in the described photovoltaic module group, and described photovoltaic module is gathered solar energy and changed this solar energy into direct current energy and sends to the prime control module;
Prime control module string group, described prime control module string group comprises 2 groups of above prime control modules that are provided with the corresponding one by one also series connection of described photovoltaic module, after described prime control module receives the direct current energy that described photovoltaic module sends, carry out voltage transformation under the condition of fixed current value, difference is the electric current of level control module Maximum Power Output value backward;
Back level control module group, described back level control module group comprises the back level control module that is arranged in parallel more than 2, the electric current of the prime control module input that the described every group of series connection of described back level control module connection reception is provided with carries out sending to the inversion modular converter behind the dc voltage conversion;
Inversion modular converter, described inversion modular converter connect the electric current that receives the back level control module input that respectively is arranged in parallel in the level control module group of described back, and this direct current is converted to the laggard line output of alternating current.
Further, described prime control module comprises:
First filter unit, described first filter unit receive the electric current that described photovoltaic module sends, and carry out sending to voltage transformation module after the filtering;
Voltage transformation module, described voltage transformation module receive the electric current that described first filter unit sends and send to second filter unit after carrying out voltage transformation under the tracking Control unit controls;
Second filter unit, described second filter unit receive the electric current that described voltage transformation module sends to carry out sending to output unit after the filtering;
Output unit, described output unit receive the electric current that described second filter unit sends and export;
Described photovoltaic module voltage and current parameters and output unit voltage parameter are gathered in tracking Control unit, described tracking Control unit, and according to current value fixedly the linear change of power output maximum control the action of described voltage transformation module.
Further, described tracking Control unit comprises:
Measure subelement, described measurement subelement is measured photovoltaic module voltage value and current value, and sends to control sub unit with parametric form;
The feedback subelement, the described output unit magnitude of voltage of described feedback subelement tracing and monitoring, and send to described control sub unit with parametric form;
Control sub unit, described control sub unit receive described measurement subelement and the parameter value that the feedback subelement sends, and according to setting current value, control each parameter when calculating maximum power output, and this parameter is sent to the adjustment subelement;
Adjust subelement, described adjustment subelement receives each Control Parameter that described control sub unit is sent, and adjusts each parameter value according to the duty ratio restriction, and controls described voltage transformation module action according to adjusted parameter value.
Further; also be connected with the intelligent protection unit between described second filter unit and the described output unit; described intelligent protection unit receives the electric current that described second filter unit sends and tests; and with set the protection value and compare, take to send to described output unit behind the corresponding measure.
Further, described intelligent protection unit comprises:
The test subelement, described test subelement is tested described photovoltaic module voltage and current parameters and output unit voltage parameter, and will test afterwards that data send to judgment sub-unit;
Judgment sub-unit, described judgment sub-unit receive the data that described test subelement sends, and compare according to default protection parameter, according to the action of comparison result control break-make subelement;
Break-make subelement, described break-make subelement are communicated with under the control of described judgment sub-unit and disconnect circuit between described second filter unit and the output unit.
The present invention has following advantage:
1, the present invention adopts electric current and voltage two-stage control model.The prime control module is used the fixed current mode, the photovoltaic module that control is connected in series; Back level control module is used the fixed voltage mode, the photovoltaic module group that control is connected in parallel.This control structure has been eliminated the influence between the adjacent block, and Nei photovoltaic module does not influence each other on the same group, does not need to obtain the information of adjacent block, has simplified the output control of module, has improved the stability and the reliability of power output control and electricity generation system.
2, the tracking Control cellular construction is simple among the present invention, can effectively follow the tracks of the parameters of input, output current, carries out online compensation and correction, improves the power delivery efficiency, and the stability of guaranteed output output.
3, the present invention has also adopted the intelligent protection unit; can judge parameter states such as open circuit voltage, short circuit current and panel temperatures; thereby provide protection to photovoltaic module, improve photovoltaic generating system reliability and self-protection function, reduce unnecessary loss.
4, simple in structure, the reliable and stability height of the present invention, the present invention relies on reasonable structure to reduce cost and operation easier, is easy to promotion and application.
Description of drawings
Below in conjunction with accompanying drawing embodiments of the present invention are described further:
Fig. 1 shows present power output control structure schematic diagram;
Fig. 2 shows the distributed maximum power output system of a kind of photovoltaic generation of the present invention structural representation.
Embodiment
As shown in Figure 2, the present invention includes solar collecting device 1, prime control module string group 2, back level control module group 3 and inversion modular converter 4.Solar collecting device 1 is used to gather solar energy, and it is maximum to reach power output by prime control module string group 2 and back level control module group 3 two-stages control, is undertaken carrying out electric current output after the current conversion by inversion modular converter 4 then.
Solar collecting device 1 comprises 2 groups of above photovoltaic module groups 11, each photovoltaic module 111 all is connected with prime control module 21 in the photovoltaic module group 11, and photovoltaic module 111 is gathered solar energy and changed this solar energy into direct current energy and sends to prime control module 21.
Prime control module string group 2 comprises 2 groups of above prime control modules 21 that are provided with the corresponding one by one also series connection of photovoltaic module 111, behind the direct current energy that prime control module 21 reception photovoltaic modules 111 send, carry out voltage transformation under the condition of fixed current value, difference is the electric current of level control module 31 Maximum Power Output values backward.
Back level control module group 3 comprises the back level control module 31 that is arranged in parallel more than 2, and back level control module 31 connects the electric current that receives prime control module 21 inputs that every group of series connection be provided with, and carries out sending to inversion modular converter 4 behind the dc voltage conversion.
Inversion modular converter 4 connects the electric current that receives back level control module 31 inputs that respectively are arranged in parallel in the back level control module group 3, and this direct current is converted to the laggard line output of alternating current.
The present invention adopts electric current and voltage two-stage control model.Prime control module 2 is used the fixed current mode, the photovoltaic module that control is connected in series; Back level control module 3 is used the fixed voltage mode, the photovoltaic module group that control is connected in parallel.This control structure has been eliminated the influence between the adjacent block, Nei photovoltaic module 111 not influence each other on the same group, do not need to obtain the information of adjacent block, simplified the output control of module, improved the stability and the reliability of power output control and electricity generation system.
Among the present invention, prime control module 21 comprises first filter unit 211, voltage transformation module 212, second filter unit 213, output unit 214 and tracking Control unit 215.First filter unit 211 and second filter unit 213 are used for filtering, and voltage transformation module 212 is used for voltage transformation, and output unit 214 is used for output current, and tracking Control unit 215 is used to control voltage transformation to realize the power output maximum.
First filter unit, 211 two ends connect photovoltaic module 111 respectively and receive the electric current that photovoltaic module 111 sends with voltage transformation module 212, the first filter units 211, carry out sending to voltage transformation module 212 after the filtering.
Voltage transformation module 212 two ends connect first filter unit 211 and second filter unit 213 respectively, and voltage transformation module 212 also is subjected to tracking Control unit controls 215.Voltage transformation module 212 receives the electric current that first filter unit 211 sends, and after carrying out voltage transformation under 215 controls of tracking Control unit electric current is sent to second filter unit 213.
Second filter unit, 213 two ends connect voltage transformation module 212 respectively and carry out sending to output unit 214 after the filtering with the electric current that output unit 214, the second filter units 213 reception voltage transformation modules 212 send.
Photovoltaic module electricity 111 pressures and current parameters and output unit 214 voltage parameters are gathered in tracking Control unit 215, and according to fixedly linear change control voltage transformation module 212 actions of power output maximum of current value.
In the present invention, tracking Control unit 215 also comprises measurement subelement 2151, feedback subelement 2152, control sub unit 2153 and adjusts subelement 2154.Wherein:
Measure subelement 2151 and measure photovoltaic module 111 magnitudes of voltage and current value, and send to control sub unit 2153 with parametric form.
Feed back subelement 2152 tracing and monitoring output units 214 magnitudes of voltage, and send to control sub unit 2153 with parametric form.
Adjust subelement 2154 and receive each Control Parameter that control sub unit 2153 is sent, and adjust each parameter value according to the duty ratio restriction, and according to 212 actions of adjusted parameter value control voltage transformation module.
Among the present invention; also be connected with intelligent protection unit 216 between second filter unit 213 and the output unit 214; the electric current that intelligent protection unit 216 receptions, second filter unit 213 sends is tested; and with set the protection value and compare, take to send to output unit 214 behind the corresponding measure.
The data that judgment sub-unit 2162 acceptance test subelements 2161 send, and compare according to default protection parameter, according to comparison result control break-make subelement action 2163.In judgment sub-unit 2162, carry out data prediction, threshold setting, thereby make fuzzy Judgment, and send the corresponding actions instruction to break-make subelement 2163 with reference to historical data, Mathematical Modeling.
Break-make subelement 2163 is communicated with under judgment sub-unit 2162 control and disconnects circuit between second filter unit 213 and the output unit 214.
The present invention has also adopted intelligent protection unit 216; can judge parameter states such as open circuit voltage, short circuit current and panel temperatures; thereby provide protection to photovoltaic module 111, improve photovoltaic generating system reliability and self-protection function, reduce unnecessary loss.
The present invention is simple in structure, reliable and stability is high, and the present invention relies on reasonable structure to reduce cost and operation easier, is easy to promotion and application.
In sum; being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention, therefore; all any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the distributed maximum power output system of photovoltaic generation is characterized in that, comprising:
Solar collecting device (1), described solar collecting device (1) comprises 2 groups of above photovoltaic module groups (11), each photovoltaic module (111) all is connected with prime control module (21) in the described photovoltaic module group (11), and described photovoltaic module (111) is gathered solar energy and changed this solar energy into direct current energy and sends to prime control module (21);
Prime control module string group (2), described prime control module string group (2) comprises 2 groups of above prime control modules (21) that are provided with the corresponding one by one also series connection of described photovoltaic module (111), after described prime control module (21) receives the direct current energy that described photovoltaic module (111) sends, carry out voltage transformation under the condition of fixed current value, difference is the electric current of level control module (31) Maximum Power Output value backward;
Back level control module group (3), described back level control module group (3) comprises the back level control module (31) that is arranged in parallel more than 2, the electric current of prime control module (21) input that the described every group of series connection of described back level control module (31) connection reception is provided with carries out sending to inversion modular converter (4) behind the dc voltage conversion;
Inversion modular converter (4), described inversion modular converter (4) connect the electric current that receives back level control module (31) input that respectively is arranged in parallel in the described back level control module group (3), and this direct current is converted to the laggard line output of alternating current.
2. the distributed maximum power output system of photovoltaic generation as claimed in claim 1 is characterized in that: described prime control module (21) comprising:
First filter unit (211), described first filter unit (211) receive the electric current that described photovoltaic module (111) sends, and carry out sending to voltage transformation module (212) after the filtering;
Voltage transformation module (212), the electric current that described voltage transformation module (212) described first filter unit of reception (211) sends sends to second filter unit (213) after carrying out voltage transformation under tracking Control unit (215) control;
Second filter unit (213), described second filter unit (213) receive the electric current that described voltage transformation module (212) sends to carry out sending to output unit (214) after the filtering;
Output unit (214), described output unit (214) receive the electric current that described second filter unit (213) sends and export;
Tracking Control unit (215), described photovoltaic module (111) voltage and current parameters and output unit (214) voltage parameter are gathered in described tracking Control unit (215), and according to current value fixedly the linear change of power output maximum control described voltage transformation module (212) action.
3. the distributed maximum power output system of photovoltaic generation as claimed in claim 2 is characterized in that: described tracking Control unit (215) comprising:
Measure subelement (2151), described measurement subelement (2151) is measured photovoltaic module (111) magnitude of voltage and current value, and sends to control sub unit (2153) with parametric form;
Feedback subelement (2152), the described output unit of described feedback subelement (2152) tracing and monitoring (214) magnitude of voltage, and send to described control sub unit (2153) with parametric form;
Control sub unit (2153), described control sub unit (2153) receives described measurement subelement (2151) and feeds back the parameter value that subelement (2152) sends, according to setting current value, Control Parameter when calculating maximum power output, and this parameter sent to adjust subelement (2154);
Adjust subelement (2154), described adjustment subelement (2154) receives each Control Parameter that described control sub unit (2153) is sent, and according to each parameter value of duty ratio restriction adjustment, and control described voltage transformation module (212) according to adjusted parameter value and move.
4. the distributed maximum power output system of photovoltaic generation as claimed in claim 3; it is characterized in that: also be connected with intelligent protection unit (216) between described second filter unit (213) and the described output unit (214); the electric current that described intelligent protection unit (216) described second filter unit of reception (213) sends is tested; and with set the protection value and compare, take to send to described output unit (214) behind the corresponding measure.
5. the distributed maximum power output system of photovoltaic generation as claimed in claim 4 is characterized in that: described intelligent protection unit (216) comprising:
Test subelement (2161), described test subelement (2161) is tested described photovoltaic module (111) voltage and current parameters and output unit (214) voltage parameter, and will test afterwards that data send to judgment sub-unit (2162);
Judgment sub-unit (2162), described judgment sub-unit (2162) receives the data that described test subelement (2161) sends, and compares according to default protection parameter, according to comparison result control break-make subelement (2163) action;
Break-make subelement (2163), described break-make subelement (2163) are communicated with under described judgment sub-unit (2162) control and disconnect circuit between described second filter unit (213) and the output unit (214).
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| CN2010102810132A CN101964608B (en) | 2010-09-13 | 2010-09-13 | Photovoltaic power generation distribution type maximum power output system |
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| CN2010102810132A CN101964608B (en) | 2010-09-13 | 2010-09-13 | Photovoltaic power generation distribution type maximum power output system |
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| CN103688228A (en) * | 2011-02-17 | 2014-03-26 | 德克萨斯仪器股份有限公司 | Device and method for optimizing output power of solar cell |
| CN105556832A (en) * | 2013-08-26 | 2016-05-04 | Rts能源有限公司 | Micro converter apparatus for photovoltaic energy generation source and controlling method therefor |
| CN107809136A (en) * | 2017-09-08 | 2018-03-16 | 北京金鸿泰科技有限公司 | A kind of method and apparatus for compensating component output current |
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